Camillus Obayi, Anthony Asadu, Paul Nnamchi and Peter Offor
Keywords: Cow bone powder, inorganic coating, corrosion resistance, Martensitic stainless steel, sea water
<p class="MsoNormal" style="line-height:normal">The major limitation of martensitic stainless steel (MSS) is low corrosion resistance in severe environments containing chloride ions. Several methods have been used to modify the surfaces of stainless steels in order to improve both its corrosion and pitting corrosion resistance. This work aimed at mitigating the corrosion of MSS (AISI 410) via surface modification using dissolved cow bone (CB) powder. CB samples were dried and pulverized into fine powder and dissolved in Nitric acid using wet digestion technique. The dissolved CB was deposited on the MSS surface using spray deposition method at deposit times of 3, 6 and 9 minutes. The corrosion behaviour of coated MSS samples was determined in sea water using Potentiodynamic polarization testing technique. The results showed that CB deposition improved corrosion resistance of MSS significantly. The corrosion resistance of the control MSS sample improved from 0.0151 gram/hr to 0.0075 gram/hr, 0.0058 gram/hr and 0.0039 gram/hr for samples coated for 3, 6 and 9 minutes, respectively. The results strongly indicate that CB, a readily and locally available waste material in Nigeria can be used to moderate the corrosion resistance of stainless steel. </p>
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